Observation 80487: Amanita cornelihybrida K.W. Hughes, Tulloss & Rodrig. Cayc. nom. prov.

I know this is a longshot, but this specimen seems to agree well with the descriptions found on the Amanita Studies website.

Bulb not chiseled, short limbate.

Non striate somewhat streaked cap with marginate volval material.

Ring looks more like citrina than brunnescens.

Spores strongly amyloid.


Proposed Names

-7% (2)
Recognized by sight: Looks a bit like citrina but with cream colored cap and brown stains.
Used references: Amanita Studies website
54% (1)
Based on chemical features: LSU sequence a very good match to the typical sequences from the lavender-staining infraspecific hybrid “swarm” known from eastern North America.

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
Rod, I think I may have found more…
By: Dave W (Dave W)
2018-02-13 22:07:08 CST (-0600)

of these very pale A. cornelihyrida last summer obs 292895. Brown stain is not as prominent, but is evident on the one cap.

David, I want to clarify the situation a bit.
By: R. E. Tulloss (ret)
2017-05-11 10:31:46 CDT (-0500)

The taxon is well-defined genetically. Karen examined its status using five genes.
Only the nrITS (“barcode”) is in such an unusual state. Some variation is seen in other genes, but this variation is not unusual. The nrLSU sequence can be used to characterized the present species within the “lavendula-group.” In the end, the species can be characterized with a good confidence level by its DNA. It’s just that a straightforward run with the Sanger sequencing process does not yield a coherent barcode. Even in this case, however, the rather tiny fragments that one can recover and the beginning and end of the otherwise useless barcode have enough information to separate the macroscopically “confusing” taxa.

Very best,


You’re welcome, Rod.
By: Dave W (Dave W)
2017-05-10 23:37:07 CDT (-0500)

And, as usual, thanks for sharing what you find out about the mushrooms sent to you.

The fact that this species (?) defies being pegged via genetics seems to mirror it’s ambiguous macro-traits.

Another thank you is in order.
By: R. E. Tulloss (ret)
2017-05-10 12:05:28 CDT (-0500)

This collection is one of those featured in a new paper describing the genetic oddities of “sp-lavendula01”. This is in the final stages of editing after peer review. The lead author will be Dr. Karen Hughes. MO (and you in particular) played an important role in gathering data for this paper about a species that doesn’t cooperate in the barcoding project. It’s like a car with dozens of license plates instead of one.

Thanks very much, David.

Very best,


Whew! Thanks for the change in location.
By: R. E. Tulloss (ret)
2014-03-05 12:24:16 CST (-0600)

This impacts the website, the herbarium, data with the sequences when they are sent to GenBank…the “whole nine yards”…as you may imagine.

A very pale cap is also part of the concept of A. brunnescens var. straminea (to become A. americitrina). Like I said, the spores appear to work for differentiating these eastern North American citrinoids, but I don’t think we have a solid handle on doing field IDs at this point. The hybrid (sp-lavendula01) has what Dr. Hughes tells me is a “very large range for a hybrid” in her experince; so we are not even sure whether or not the three taxa have completely overlapping geographic ranges.

Last year several people contributed to the call for specimens; so we have a chance to look at a lot of material from Quebec and Ontario south to Florida and Texas. MO participants were very helpful with pictures and dried material. So many thanks go out to everybody who pitched in with their time and effort.

Slowly we are going through the new set of collections and reporting back to MO when we find DNA and can classify the specimens on a molecular basis. Slowly the ranges are expanding and better picture of the range of each of the taxa is appearing on the web site.

Very best,


Good afternoon, Rod.
By: Dave W (Dave W)
2014-03-05 11:39:22 CST (-0600)

I think I may have found this type in another location, but the specimen was old and disintegrating… a very white citrina look-alike with some staining.

BTW, the entry of the photo from this obs as seen on the ASW is accompanied by the location label “York County, PA.” The correct county is Lackawanna County, and the location is “Lackawanna State Forest.” (The trail that runs through this area is called “Pinchot Trail.”) There are several separate tracts of PA state forest called “Lackawanna State Forest.” I’ll edit both the observation and the location so that the specific correct area is designated.

Good morning, David.
By: R. E. Tulloss (ret)
2014-03-05 07:30:50 CST (-0600)

One of the interesting things about this specimen is how it expands the range of color that we have for the “hybrid” species. We didn’t have a white one before. And we only had one case with brown bruising on the cap before. We still don’t have many clues to separating the three purple-staining citrinoids in eastern North America by sight alone. Luckily, it remains true (at this point, at any rate) that we can separate them by spore size-shape.

Very best,


Rod, your diligence…
By: Dave W (Dave W)
2014-03-04 17:38:01 CST (-0600)

and willingness to share results are much appreciated.

Thought this looked like something interesting. I remember where I found it… spruce, hemlock, birch and maple mixed in. If I find another, I’ll dehydrate as per your recommendations.

Correction to molecular results.
By: R. E. Tulloss (ret)
2014-03-04 16:20:27 CST (-0600)

The LSU sequence derived from this material shows that the mushroom is a white-capped example of the lavender staining infra-specific hybrid taxon that is presently unnamed:


Very best,


We were not able to get a good barcode sequence from this material.
By: R. E. Tulloss (ret)
2014-02-26 13:21:46 CST (-0600)

Thank you for sending it to us. I’m hoping for better luck with future specimens. We are very grateful for you sharing your collections with us.

Very best,


By: Dave W (Dave W)
2012-04-12 11:23:33 CDT (-0500)

you are correct. The location box was misplaced by about a mile. I have updated the location for MO.

I remember the spot where I found it.
By: Dave W (Dave W)
2012-04-12 11:05:17 CDT (-0500)

Maybe there will be another.

Material received and cataloged…
By: R. E. Tulloss (ret)
2012-04-12 11:03:49 CDT (-0500)

Thank you, David.

This one remains a puzzle.

The map for collecting site (GPSP) seems not to be correct.


Citrina group seems like a reasonable proposal.
By: Dave W (Dave W)
2012-04-10 08:32:31 CDT (-0500)

Although this one does not show any yellowish (citrine) color. And the staining is brown, as opposed to the lavender which characterizes our typical local A. citrina. Maybe this one is an albino variation? (Colors in photos are true.)

Why is “Amanita species sect. Validae” not a reasonable proposal? Aren’t all of the citrina types in this section?

I have reviewed the type of the brunnescens f. _straminea
By: R. E. Tulloss (ret)
2011-11-03 19:23:24 CDT (-0500)

It is not a form of brunnescens, but belongs in the group to which North American mycologists apply the name citrina. The group is not sorted out as you know…with the notable exception that material that turns lavender in cold weather seems to match the description of Coker’s f. lavendula. Coker did say that very pale material in his collecting area appeared to him to correspond to f. lavendula. Did he mean nearly white material? Or did he mean material that was paler than the European illustrations of citrina (i.e., A. bulbosa var. citrina…if that is distinct from A. bulbosa, which some European mycologists have told me that they doubt).

In other words, I can’t answer you very well…only in a few places, here and there.

Very best,


I’m wondering if
By: Dave W (Dave W)
2011-11-03 09:37:55 CDT (-0500)

this may just be a particularly pale example of A. citrina var lavendula. The stains are also darker than what I’d expect with citrina. Also, is A. brunnescens f. staminea an acceptable name for an eastern NA amanita?

Created: 2011-10-24 18:50:58 CDT (-0500)
Last modified: 2018-02-13 22:07:09 CST (-0600)
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